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    <title>Document</title>
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    <div id="app">
        <input type="checkbox" v-model="mystate">
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    <script>
        new Vue({
        el:"#app",
        data:{
        state:true
        },
        // computed 中的值是依赖于data的
        computed:{
        mystate:{
            get(){
            console.log("get")
            return this.state
            },
            set(value){
            console.log("set")
            this.state = value
            }
        }
        }
    })
    </script>
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